Republic of The Philippines: Daraga Community College

Republic of the Philippines
Commission on Higher Education

DARAGA COMMUNITY COLLEGE
Salvacion, Daraga, Albay
NAME: Christopher R. Sevilla YEAR & SECTION: 2nd Year BSED SCIENCE B DATE:
April 10 2021
BIOCHEMISTRY: Properties of Water
Part I: Write the definition of each key term.
Polarity: is a separation of electric charge leading to a molecule or its chemical groups having
an electric dipole moment, with a negatively charged end and a positively charged end.
Cohesion: cohesive attraction or cohesive force is the action or property of like molecules
sticking together, being mutually attractive.
Adhesion: the attraction of molecules of one kind for molecules of a different kind
Capillary action: the ability of a liquid to flow in narrow spaces without the assistance of, or
even in opposition to, external forces like gravity.
Surface tension: the tendency of liquid surfaces to shrink into the minimum surface area
possible.
Specific heat: the amount of heat per unit mass required to raise the temperature by one
degree Celsius.
hydrogen bond: a primarily electrostatic force of attraction between a hydrogen (H) atom

which is covalently bound to a more electronegative atom or group
Part II: Answer the following questions.
1. Circle the letter of each sentence that is true about water's structure.
a. Water is made up of atoms bonded to form molecules.
b. Water contains half as many hydrogen atoms as oxygen atoms.
c. Water molecules tend to push away from each other.
d. The chemical formula for water is H20.
2. One side of the water molecule has a positive charge, while the other side has a negative charge.
What do the charges indicate about the molecule?
a. Water is a polar molecule. c. Water is an ionic compound.
b. Water is a nonpolar molecule. d. Water is an ion.
3. Bonds that form between water molecules are called Hydrogen bonds.
4. True or False? Hydrogen bonds are strong and require a lot of energy to break. ___True______
5. The tendency for water molecules to stick to other water molecules is called ___cohesion __
6. A force that acts on the particles of a liquid at the surface is called ___surface tension _.
7. How does surface tension force the surface of water to curve?

The molecules at the surface are being pulled by other molecules. The pulling forces the water to curve.
8. The tendency for water molecules to be attracted and stick to other substances is called adhesion
9. Circle the letter of each sentence that is true about water's surface tension.
a. It helps some insects "skate" across the surface of the water.
b. It refers to the tightness across the surface of the water.
c. It is caused by polar molecules repelling each other.
d. It causes raindrops to form round beads.
10. What is a curved surface in a graduated cylinder called? A ___Meniscus__
11. Circle the letter of each sentence that is true about capillary action.
a. It explains how water moves against the force of gravity.
b. It is due to the attraction among molecules of water and surrounding materials.
c. It prevents water from moving through materials with pores.
d. It causes clothing to stay dry.
12. How does capillary action allow water to climb up the sides of a straw?
The adhesion between water molecules and a plastic straw is also pretty strong.
Capillary action occurs when adhesive forces outweigh cohesive forces.
13. A mixture that forms when one substance dissolves another is called a(n)_solution ________
The substance that does the dissolving is called a(n) _________Solvent ________________ .
14. Why can water dissolve many substances?
Water molecules have a polar arrangement of the oxygen and hydrogen atoms—
one side (hydrogen) has a positive electrical charge and the other side (oxygen)
had a negative charge. This allows the water molecule to become attracted
to many other different types of molecules
15. Circle the letter of each substance that dissolves in water.
a. salt b. oil c. oxygen d. wax
16. A substance that hates, or “fears” water is called ___ Hydrophobic or Hydrophobia
17. The amount of heat needed to increase the temperature of a certain mass of a substance by 1°C is
its _____specific heat____________.
18. True or False? Compared with other substances, water requires a lot of heat to increase its
temperature. True
19. Circle the letter of each sentence that is true about water's specific heat.
a. It is due to the many attractions among water molecules.

b. It makes large bodies of water heat up more quickly than nearby land.
c. It makes large bodies of water cool off more slowly than nearby land.
d. It leads to warmer air over land than over water on summer days.
20. How does the high specific heat of water affect your body?
The sweat on the surface of the skin absorbs heat from the skin (and thus in turn from the blood). ... Due to
the fact water has a high specific heat capacity, sweat can extract a lot of heat from blood and can therefore
be highly efficient at lowering an animals core body temperature.
Part III: Match the following terms:
e 1. cohesion a. tendency to stick to other substances

g 2. capillary action b. tightness caused by the pulling of water molecules on each other
a 3. adhesion c. the amount of heat needed to raise 1kg of a substance 1º
f 4. polarity d. weak bonds formed between water molecules
d 5. hydrogen bond e. tendency to stick to other water molecules
b 6. surface tension f. uneven distribution of charges in a molecule
c 7. specific heat g. tendency to climb up due to cohesion & adhesion properties of H2O

Republic of The Philippines: Daraga Community College

Uploaded by

Copyright:

Available Formats

Republic of The Philippines: Daraga Community College

Uploaded by

Document Information

Original Description:

Original Title

Copyright

Available Formats

Share this document

Share or Embed Document

Sharing Options

Did you find this document useful?

Is this content inappropriate?

Copyright:

Available Formats

Republic of The Philippines: Daraga Community College

Uploaded by

Copyright:

Available Formats

Republic of the Philippines

Commission on Higher Education

BIOCHEMISTRY: Properties of Water

Part I: Write the definition of each key term.

hydrogen bond: a primarily electrostatic force of attraction between a hydrogen (H) atom

7. How does surface tension force the surface of water to curve?

a. It is due to the many attractions among water molecules.

Part III: Match the following terms:

e 1. cohesion a. tendency to stick to other substances

You might also like